We had a PTO driven auger mounted to the rear of a tractor, and a post driver on the front. We would dig a 4" hole with the auger, then drive a 6"+ diameter post into the hole. Me, my Dad, and my younger brother built 1.5 miles of fence in 6 days that way, the last 3 days were spent driving steeples.
Since the DUmmie is building a chain-link fence, perhaps the Rent-All place would have a skid-steer loader with an auger mounted to the front, but the coordination required to operate said loader is beyond that of a DUmmie. Most have trouble walking and chewing gum at the same time, the rest have to be reminded to breathe periodically.
I wonder if DUmmie Mineralman remembered the Quik-crete to set the posts in the holes with...